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Burette (réactif titrant) 4. A sample of acid rain was analyzed in a laboratory using a titration with a standard solution of sodium hydroxide. Use the evidence given in table 1 to determine the concentration of sulfurous acid in the rain sample. (5 marks) Erlenmeyer (réactif titre) Table 1: Titration of 25.0 mL of sulfurous acid solution with 0.210 mol/L sodium hydroxide solution Trial 1 2 3 4 final burette reading (mL) 11.1 21.7 32.4 43.2 Initial burette reading (mL) 0.300 11.1 21.7 32.4 Volume of NaOH(aq) added (mL)